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I want to use the dedicated multiplier but reluctant to use ip core, which generates too much files, so writed the vhdl code. I don't think the declaration of LPM_MULT is the key question. The key problem is the LPM_MULT doesn't work in modelsim, but has no problem in quartus. By the way, how to check my LPM_MULT port is right or wrong? my quartus version is 8.1 and modelsim version is 6.5a .thanks for your reply
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But the LPM mult IS an IP core, whether you use the megawizard or instantiate it yourself, its the same thing.
a <= b * c; will also use the dedicated multipliers. The advantage with this is its much less code, and you dont have to use std_logic_vectors (which are not meant for arithmatic) to do it (you should use signed and unsigned types).
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